Add limitation info about /statusbar chat user|jid

While testing https://github.com/profanity-im/profanity/pull/1817
we found that:

```
/statusbar show name (I have this off by default
/msg someone where I chose someone in my roster that has a nick assigned
/statusbar chat jid
```

Will only take effect upon creation or redraw of that tab.
Reason is that we do this in create_tab to limit building this
dynamically.

Let's leave it like it is but add a note to users.
Not worth build that string all the time.

0 files changed, 0 insertions, 0 deletions